Self-cleaning sieve.



No. 784,859. PATENTBD MAR. 14, 1905. M. W. HUNT.

.SELF CLEANING SIEVE` APPLIOATION FILED 11:13.27, 1904.

am .OQ Y Martin W.Hunt

(1.0 Vl/MA UNITED STATES Patented March 14, 1905.

PATENT OFFICE.

SELF-CLEANING SIEVE.

SPECIFICATION forming part of Letters Patent No. 784,859, dated March 14, 1905.

Application filed February 27, 1904. Serial No. 195,506.

To all 107mm/ it 71mg/ (fon/cern.'

Be it known that I, MARTIN IV. HUNT, a citizen of the United States, residing at Portland, in the county of Multnomah and State of Oreg'on, have invented certain new and useful Improvements in Self-Cleaning Sieves, of which the following is a specification.

The object of my said invention is to provide a means for cleaning the cloth (silk or wire) and the bottom board of sieves, such as are used in bolting and grading machines in iiouring-mills,` which shall be very simple and efficient.

Heretofcre sieves of the general character inquestion have been provided with cleaning devices which come in Contact with the sievecloth and dislodge the dust therefrom; but such cleaning devices have only been operated upon by the sides of the sieve structure or by regular walls running through the chambers. Such devices have required a multiplicity of the dislod ging' devices, as their travel has been in straight lines, and thus over a comparatively limited area. I have discovered that by positioning several blocks in the middle of the sieve structure I am enabled to use a single movable cleaner, which, coming into contact with the blocks, jars the cloth and keeps the same vibrating' to such an extent that it is kept cleanwith less friction and less wear from the brush, and thus produces better results than has heretofore been'done with a multiplicity of cleaners, all as will be hereinafter more particularly described and claimed.

Referring to the accompanying' drawings, which are made a part hereof and on which similar' reference characters indicate similar parts, Figure 1 is a top or plan view of a sieve provided with cleaners embodying' my said invention; Fig. 2, a transverse vertical sectional view thereof as seen when looking in the di- I'ection indicated by the arrows from the dotted line 2 2 in Fig. l; and Fig. 3, a central sectional view, on an enlarged scale, of the moving cleaner. Y

The sieve'is composed of a frame 21, an imperforate bottom 2Q, and a sieve-cloth 23, all of which are similar to the corresponding parts of devices as previously made. At points in the middle of the structure I place blocks 24,

1n operation the sieve has the gyratory movement of the machine, with the result that the cleaner 25 comes into frequent Contact with the walls of the sieve and with the blocks 24 and is by such contact, especially that with the blocks, driven rapidly in every direction throughout the entire area of the sieve, with the result .that the cloth is cleaned efficiently in every part.

Having thus fully described my said invention, what I claim as new, and'desire to secure by Letters Patent, is-

l. The combination, in a sieve, of the sieve structure, blocks secured to said structure and positioned in the middle portion of the sieve, and a cleaner mounted between the sides and walls of said sieve structure and adapted to move freely in every direction therebetween and which comes in contact with the walls of the sieve and with said blocks in operation, substantially as and for the purpose set forth.

2. The combination, in a sieve, of the sieve structure, composed of 4a suitable frame, a lower ioor, a sieve-cloth above said floor, short knocker-blocks centrally positioned and secured between said floor and said sieve-cloth, and a cleaner adapted to move freely in every direction in operation, which comes in Contact with the walls of the sieve and with said blocks in operation.

In witness whereof I have hereunto set my hand and seal, at Portland, Oregon, this 19th day of February, A. I). 1904.

MARTIN W. HUNT.

Witnesses:

GEO. O. HA'rToN, B. E. VAN VooIzIIIs. 

